Over heating when traveling at lower speeds

I have a 1995 mazda 626 v6. The problem I have is when traveling at lower speeds my engine starts heating.(indicate on the temp. meter) But if I start going fast the meter goes back. Recently I changed my termo-stat. My guess is I need a new radiator, because my coolent looks dirty. Please help me on this problem.

Your water pump is junk - Mazda uses ford parts and they are known for the vanes on the pump deteriorating ( when you go faster what is left of the pump starts working and circulating the coolant, going slow there is not enough vane left on the pump to circulate the coolant efficiently) - a good flush wouldnt hurt either, //// to put it into perspective> kind of imagine a fan with the blades shortened, on low no air is really circulated - but put it on high and it may push as much air air it normally would on low, same thing is happening under your hood!

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Hello! The Throttle Positioning sensor (TPS) is the likely culprit...It is mounted to the throttle body and has a three wire connector...Wire colors are Green/Red. Violet/Yellow and Black/Yellow. The connector may not be fully seated, or has an open wire...If it passes a visual inspection you can test with a voltmeter...With connector in place...And engine at idle...Set volt meter to measure 1 - 4 volts without changing scales...If meter probes will not fit the rear of the connector push in paper clips...connect + meter probe to Violet/Yellow...and - probe to Green/Red...You should read less than 1 volt at idle...Slowly increase engine speed...Voltage should rise to 4 volts SMOOTHLY...If it jumps, jerks or acts erratically The TPS is defective...Send a comment with results.....Guru...........saailer

The thermostat is located on the engine block, where the upper radiator hose connects to the engine. You'll see a large elbow-like component that is attached to the engine with 2 bolts.
Just follow that upper radiator hose and you got the location. When you remove that housing (elbow-like component), you'll see the thermostat.Make sure you note which end of the thermostat is up and which end is down. Don't reverse the install.

I have a 1995 Mazada 626 V6 and i had a simular problem. My mechanic couldn't figure it out. My boyfriend did the usual checks also, but 1 thing extra he raised the idle to 1100-1200 rpm's from the 750-1000 it was at...well since then no problem.
good luck